linux-kernel - Re: [PATCH V4 09/16] soc: tegra: pmc: Ensure partitions can be toggled on/off by PMC

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Message-ID: <5698BC96.6040709@nvidia.com>
Date:	Fri, 15 Jan 2016 09:32:06 +0000
From:	Jon Hunter <jonathanh@...dia.com>
To:	Thierry Reding <thierry.reding@...il.com>
CC:	Philipp Zabel <p.zabel@...gutronix.de>,
	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Rafael Wysocki <rjw@...ysocki.net>,
	Kevin Hilman <khilman@...nel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Vince Hsu <vinceh@...dia.com>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
	<linux-pm@...r.kernel.org>
Subject: Re: [PATCH V4 09/16] soc: tegra: pmc: Ensure partitions can be
 toggled on/off by PMC


On 14/01/16 14:14, Thierry Reding wrote:
> * PGP Signed by an unknown key
> 
> On Fri, Dec 04, 2015 at 02:57:10PM +0000, Jon Hunter wrote:
>> For Tegra124 and Tegra210, the GPU partition cannot be toggled on and off
>> via the APBDEV_PMC_PWRGATE_TOGGLE_0 register. For these devices, the
>> partition is simply powered up and down via an external regulator.
>> Describe in the PMC SoC data in which devices the GPU partition can be
>> controlled via the APBDEV_PMC_PWRGATE_TOGGLE_0 register and ensure that
>> no one can incorrectly try to toggle the GPU partition via the
>> APBDEV_PMC_PWRGATE_TOGGLE_0 register.
>>
>> Signed-off-by: Jon Hunter <jonathanh@...dia.com>
>> ---
>>  drivers/soc/tegra/pmc.c | 11 +++++++++++
>>  1 file changed, 11 insertions(+)
> 
> The TRM doesn't mention anything like this. Will this be updated in the
> TRM as well?

For T210, I have requested that the partitions are updated. Looks like
the powergate sequencing information for T210 is still missing from the
TRM. I can request that this is added. I will make a note for T124 as
well as it is missing.

Cheers
Jon